2155105105 has 8 divisors (see below), whose sum is σ = 2587739112. Its totient is φ = 1723008768.

The previous prime is 2155105093. The next prime is 2155105171. The reversal of 2155105105 is 5015015512.

It can be written as a sum of positive squares in 4 ways, for example, as 931714576 + 1223390529 = 30524^2 + 34977^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155105105 - 2¹¹ = 2155103057 is a prime.

It is a super-2 number, since 2×2155105105² = 9288956027194122050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155105105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125544 + ... + 141673.

It is an arithmetic number, because the mean of its divisors is an integer number (323467389).

Almost surely, 2^2155105105 is an apocalyptic number.

It is an amenable number.

2155105105 is a deficient number, since it is larger than the sum of its proper divisors (432634007).

2155105105 is a wasteful number, since it uses less digits than its factorization.

2155105105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268835.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 2155105105 is about 46423.1096007150. The cubic root of 2155105105 is about 1291.6836188595.

The spelling of 2155105105 in words is "two billion, one hundred fifty-five million, one hundred five thousand, one hundred five".